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Cycling | Cycling |

Knog Boomer USB Rechargeable Front Light

51 customer reviews

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  • Knog Boomer USB Rechargeable Front Light (Pink)
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About the Product

  • Super-bright High powered white LED
  • Burn time of 3.5 hours constant, and 12 hours in flashing mode
  • 55 lumens output
  • 4 modes: Constant, Strobe flash, Fast flash, Random strobe
  • 42 grams

Frequently Bought Together

Knog Boomer USB Rechargeable Front Light (Pink) + Cygolite Hotshot 2-Watt USB Rechargeable Taillight with USB Cable
Price for both: $62.84

Buy the selected items together

Technical Details

Product Description

To preserve the condition of the Lithium battery, when the Boomer isn't used for an extended period, the batteries should rest at 50% charge. To achieve this, simply charge the Boomer to 100%, hold down the button for 5 seconds. This will turn the light on and automatically shut the Boomer off when the battery reaches 50% charge.

Product Details

  • Shipping Weight: 1 pounds (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • Item model number: LT8-BOOMER USB-F
  • Average Customer Review: 4.0 out of 5 stars  See all reviews (51 customer reviews)
  • Amazon Best Sellers Rank: #178,606 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
  • Product Warranty: For warranty information about this product, please click here

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Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

24 of 25 people found the following review helpful By Hilary M. Stinnett on April 25, 2011
I was initially hesitant to purchase the Knog due to the reviews on the the battery powered version, but the USB design with a higher lumenal output (brighter light) and a wider beam than most headlights on the market sold me. It looks like they fixed all the past problems with this version.
First and foremost, I was *really* impressed with how wide and bright the light is. I commute about ~8 miles to and from work every day and 3 miles of that is through a paved forest trail (no lamps) around twilight. This little headlight lights up the entire forest trail, with the brightest center of the beam covering the full 6 foot width of the path, and the peripheral halo lights up the bushes and plants all around. There are yellow rings within the bluish-white beam which make it easier to make out what exactly that bump in the road ahead is (groundhog vs. big rock). I used to feel very claustrophobic during night rides because my old headlight had such a narrow beam; not so with this light. This headlight is brighter than many of my friends' headlights with a much wider beam.

PROS: Very wide dichromatic beam, bright light, small, adjustable, holds its position very well over minor bumps (boardwalks, manhole covers, filled potholes), and easily adjusted midride. Silicone cover ensures it fits every bicycle in my arsenal. 4 different modes (3 flashing patterns, 1 constant). Easily turned off through soft gloves/if your hands are frozen stiff, but too sensitive to be tossed into a bag with other things without getting turned on. USB Rechargeable. Indicator light shines when plugged into USB (bright red).
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18 of 19 people found the following review helpful By DC Bike RIder on September 13, 2011
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I got the Knog Boomer USB rechargeable in July 2011. At first I was impressed with the brightness and adaptability of the mount. However, after a month, following a recharge, it simply stopped working! An email to knog went's past the amazon "window of return." A waste. Well, not quite. Go pick up any cheap LED flashlight, cut a hole in the back of the handy knog boomer mount, insert the flashlight, attach to handle bar and voila! The same quality light for pennies on the dollar.
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8 of 8 people found the following review helpful By icoleslaw on November 30, 2011
Verified Purchase
There are two main functions of bike lighting-- being seen by others, and seeing the road. The beam is powerful enough and has a wide enough dispersion pattern that you'll be pretty darned hard to miss by oncoming traffic (at least in fair weather), far more so than any of the 2008-era LED front lights I've tried up until now, and the vast majority of bike lights I encounter in my night commute through San Francisco. As for seeing the road, it's not really bright enough to be ideal, but is sufficient to actually sort of get by in a pinch. (Note: for some reason (perhaps to avoid too much drain on the Li-Ion battery), the light from the "constant on" setting is not as bright as some of strobe settings) I would definitely recommend this light to anyone who rides in an illuminated environment at night and wants primarily something to make themselves more visible to cars, it will get the job done.

As well as being functional, the form is great too. It's *small*. Cute, easy to remove from my bike and put back on in a jiffy.

One final note on translucency: I ordered the translucent model because I hoped it would increase the side visibility of the light, which it did, however this actually hurt my night vision due to the emitted light shining from the body into my eye. As a workaround I taped up most of the body with black electrical tape (possibly making the light less attractive to thieves). If you are sensitive to this sort of thing you might want to consider an opaque color.
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15 of 18 people found the following review helpful By whambam on December 20, 2011
- Stable on the handle bars and seat post. No bouncing around.
- Easy to get on and off, though slim enough to leave on all the time.
- Pretty bright, especially for a safety light.

- The front light shines back into me eyes, since the front lens part sticks out from the black rubbery part. I put electrical tape over it for now. Lame.
- Too many unnecessary modes. Flashing, steady, and off (in that order) is all that's necessary.
- Hard to find the button when wearing gloves, which is compounded by the next con.
- Somehow, even though there is a single button, it is confusing to operate. The light flashes to acknowledge that you've changed modes, even OFF, which makes it hard to tell which mode it's entered. It has some sort of shortcut-to-off feature, which turns the light off at unexpected times. It remembers which mode you were in last, I guess, but I use both flashing and steady, so this is just annoying. Stop trying to be clever, just make each button push advance a mode.
- The steady mode is dimmer than the flashing modes. I was very disappointed to find this out.

I feel like this design has a lot of potential, especially as a USB rechargeable upgrade to the Skink. Drop the silly in-between modes, make the steady mode brighter, make the button easier to find and simpler to operate. And change the design to prevent the front light from shining backwards into my eyes: I'm going to have a seizure!
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Knog Boomer USB Rechargeable Front Light (Pink)
This item: Knog Boomer USB Rechargeable Front Light (Pink)
Price: $35.14
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